Photovoltaic panels

Abstract

The utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module. The photovoltaic module includes a front plate, a three-terminal laminated battery, a back plate and an interconnection strip, and the three-terminal laminated battery is located between the front plate and the back plate. The three-terminal laminated battery includes N battery cells, each of which includes a first battery layer, a tunneling layer and a second battery layer, and the tunneling layer is arranged between the first battery layer and the second battery layer and electrically connects the first battery layer and the second battery layer. A top contact terminal is arranged on the first battery layer, a common contact terminal is arranged on the tunneling layer, and a bottom contact terminal is arranged on the second battery layer. The interconnection strip connects a plurality of battery cells in series to form a battery string. The photovoltaic module can reduce the current mismatch phenomenon between the first battery layer and the second battery layer of the three-terminal laminated battery, improve the power generation efficiency of the photovoltaic module, and save costs.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] In the development history of photovoltaic cells, due to the existence of the SQ theoretical limit, the development space of conventional monocrystalline silicon cells is limited. At present, the photoelectric conversion efficiency of mainstream monocrystalline silicon cells on the market has reached 26.8%, close to its theoretical efficiency value of 29.4%. It is becoming increasingly difficult to further improve the photoelectric conversion efficiency of monocrystalline silicon cells.

[0003] According to the principle of spectrum matching, combining solar cells with different band gaps to form a tandem solar cell (also called a tandem cell) can greatly broaden the spectral response, reduce the loss of carriers, and thus greatly improve the photoelectric conversion efficiency of the cell. The main working principle of the tandem cell is: the wide band gap top cell absorbs high energy photons, and the narrow band gap bottom cell improves the photon utilization rate. The combination of the two can break through the theoretical efficiency limit of single crystal silicon cells.

[0004] However, when the outdoor weather changes and the spectrum changes, the photovoltaic modules with stacked cells in the prior art are prone to current mismatch between the top cell and the bottom cell of the stacked cells, thereby reducing the power generation efficiency and increasing the cost. Therefore, it is urgent to design a photovoltaic module to solve the problem of current mismatch between the top cell and the bottom cell of the stacked cells caused by the change of the outdoor spectrum. Utility Model Content

[0005] The utility model aims to provide a photovoltaic module, reduce the current mismatch between the first battery layer and the second battery layer of a three-terminal stacked battery, improve the power generation efficiency of the photovoltaic module, and save costs.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a photovoltaic module, comprising a front plate, a three-terminal laminated battery and a back plate, wherein the three-terminal laminated battery is located between the front plate and the back plate;

[0008] The three-terminal stacked battery comprises N battery cells, each of which comprises a first battery layer, a tunneling layer, and a second battery layer, wherein the tunneling layer is arranged between the first battery layer and the second battery layer and electrically connects the first battery layer and the second battery layer;

[0009] A top contact terminal is provided on the first battery layer, a common contact terminal is provided on the tunneling layer, and a bottom contact terminal is provided on the second battery layer;

[0010] A plurality of interconnecting bars, wherein the interconnecting bars connect the plurality of battery cells in series to form a battery string; along the extension direction of the battery string, the top contact terminal of the X-th battery cell is connected to the common contact terminal of the X+3-th battery cell through the interconnecting bars, and the common contact terminal of the X-th battery cell is connected to the bottom contact terminal of the X+2-th battery cell through the interconnecting bars, 1≤X≤N-3, N≥4, and X and N are both positive integers.

[0011] As an optional technical solution of a photovoltaic module, when the number N of the cells in each cell string is greater than 6, it is defined that: the first three cells of the cell string are F1, F2 and F3, respectively, and the last three cells are L1, L2 and L3, respectively; the photovoltaic module includes a first junction box and a second junction box, and the first junction box and the second junction box are both arranged on the back plate;

[0012] The common contact terminal and the bottom contact terminal of the first battery cell are respectively connected to the first junction box through the interconnection bar, the common contact terminal and the bottom contact terminal of the second battery cell are respectively connected to the first junction box through the interconnection bar, and the common contact terminal of the third battery cell is connected to the first junction box through the interconnection bar; and

[0013] The top contact end and the common contact end of the penultimate battery cell are respectively connected to the second junction box through the interconnection strip, the top contact end and the common contact end of the penultimate battery cell are respectively connected to the second junction box through the interconnection strip, and the top contact end of the third-to-last battery cell is connected to the second junction box through the interconnection strip.

[0014] As an optional technical solution for a photovoltaic module, the first cell layer and the second cell layer are both perovskite cells, or the first cell layer is a perovskite cell and the second cell layer is a crystalline silicon cell.

[0015] As an optional technical solution of a photovoltaic component, in each battery string, a preset spacing is set between two adjacent battery cells, and multiple preset spacings are equal.

[0016] As an optional technical solution for a photovoltaic module, the cell comprises a half-cell cell.

[0017] As an optional technical solution for a photovoltaic module, the top contact terminal is located at the short side of the half-cell, and the common contact terminal and the bottom contact terminal are respectively located at two opposite long sides of the half-cell.

[0018] As an optional technical solution for a photovoltaic module, the photovoltaic module includes a first packaging film and a second packaging film, the battery string is arranged between the first packaging film and the second packaging film, and the second packaging film is provided with a plurality of first through holes for the interconnection strips to pass through.

[0019] As an optional technical solution for a photovoltaic module, the photovoltaic module also includes an insulating layer, which is arranged between the second packaging film and the backplane, and a second through hole corresponding to the first through hole is opened on the insulating layer, and the second through hole is configured to penetrate the interconnection strip.

[0020] As an optional technical solution of a photovoltaic module, the photovoltaic module further includes a third packaging film, which is arranged between the insulating layer and the back plate, and has a third through hole for the interconnection strip to pass through.

[0021] As an optional technical solution of a photovoltaic module, the photovoltaic module further includes a sealing strip, an annular groove is provided between the front plate and the back plate, and the sealing strip is wound in the annular groove.

[0022] The beneficial effects of the utility model include at least:

[0023] The utility model provides a photovoltaic module, which includes a front plate, a three-terminal laminated battery, a back plate and an interconnection strip, wherein the three-terminal laminated battery is located between the front plate and the back plate. The three-terminal laminated battery includes N battery cells, each of which includes a first battery layer, a tunneling layer and a second battery layer, and the tunneling layer is arranged between the first battery layer and the second battery layer and electrically connects the first battery layer and the second battery layer. A top contact terminal is arranged on the first battery layer, a common contact terminal is arranged on the tunneling layer, and a bottom contact terminal is arranged on the second battery layer. The common contact terminal serves as a positive electrode, and the top contact terminal and the bottom contact terminal both serve as negative electrodes, so that the top contact terminal and the common contact terminal can be connected and form a main circuit, and the bottom contact terminal and the common contact terminal can be connected and form an auxiliary circuit. In addition, the main circuit and the auxiliary circuit are also electrically connected.

[0024] The interconnection bar connects multiple battery cells in series to form a battery string; along the extension direction of the battery string, the top contact terminal of the Xth battery cell is connected to the common contact terminal of the X+3th battery cell through the interconnection bar, and the common contact terminal of the Xth battery cell is connected to the bottom contact terminal of the X+2th battery cell through the interconnection bar, 1≤X≤N-3, N≥4, and X and N are both positive integers.

[0025] By using interconnecting strips to stagger the cells in each cell string, the maximum operating voltage of the first cell layer (top cell) and the maximum operating voltage of the second cell layer (bottom cell) of each cell in the photovoltaic module can match each other. In this way, when the outdoor weather changes (for example, in rainy weather or other scenes with insufficient light intensity), causing the spectrum to change, the current of the main circuit and the auxiliary circuit can be automatically adjusted, so that the operating voltage of the top cell and the operating voltage of the bottom cell are both set to the ideal voltage value or close to the ideal voltage value, thereby solving the current mismatch phenomenon between the first cell layer (top cell) and the second cell layer (bottom cell), improving the power generation efficiency of the photovoltaic module, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0027] Figure 1 An exploded view of a photovoltaic module provided by an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of a battery string provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of a battery cell provided in an embodiment of the utility model.

[0030] Reference numerals

[0031] 100. Front plate;

[0032] 200, Sealing strips;

[0033] 300, a first packaging film;

[0034] 400, battery cell; T, top contact terminal; C, common contact terminal; B, bottom contact terminal;

[0035] 500, second packaging film; 510, first through hole;

[0036] 600, insulating layer; 610, second through hole;

[0037] 700, interconnection strip;

[0038] 800, a third packaging film; 810, a third through hole;

[0039] 900, back plate; 910, fourth through hole;

[0040] 1000, first junction box; 2000, second junction box. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of this embodiment, unless otherwise specified, the term "plurality" refers to a quantity of two or more than two.

[0049] This embodiment provides a photovoltaic module, which can reduce the current mismatch between the first battery layer (top battery) and the second battery layer (bottom battery) of the three-terminal stacked battery, improve the power generation efficiency of the photovoltaic module, and save costs.

[0050] like Figure 1-Figure 3 As shown, the photovoltaic module mainly includes a front plate 100, a three-terminal laminated battery, a back plate 900 and an interconnection bar 700, and the three-terminal laminated battery is located between the front plate 100 and the back plate 900. The three-terminal laminated battery includes N battery cells 400, each of which includes a first battery layer, a tunneling layer and a second battery layer. The tunneling layer is arranged between the first battery layer and the second battery layer and electrically connects the first battery layer and the second battery layer. A top contact terminal T is arranged on the first battery layer, a common contact terminal C is arranged on the tunneling layer, and a bottom contact terminal B is arranged on the second battery layer. The common contact terminal C serves as a positive electrode, and the top contact terminal T and the bottom contact terminal B serve as negative electrodes, so that the top contact terminal T and the common contact terminal C can be connected and form a main circuit, and the bottom contact terminal B and the common contact terminal C can be connected and form an auxiliary circuit. In addition, the main circuit and the auxiliary circuit are also electrically connected.

[0051] The interconnection bar 700 connects multiple battery cells 400 in series to form a battery string; along the extension direction of the battery string, the top contact terminal T of the Xth battery cell 400 is connected to the common contact terminal C of the X+3th battery cell 400 through the interconnection bar 700, and the common contact terminal C of the Xth battery cell 400 is connected to the bottom contact terminal B of the X+2th battery cell 400 through the interconnection bar 700, 1≤X≤N-3, N≥4, and X and N are both positive integers.

[0052] By using the interconnection strips 700 to stagger the cells 400 in each cell string, the maximum operating voltage of the first cell layer (top cell) and the maximum operating voltage of the second cell layer (bottom cell) of each cell 400 in the photovoltaic module can match each other, for example, the ratio of the maximum operating voltage of the top cell to the maximum operating voltage of the bottom cell is 3:2, 4:3, 2:1, etc. In this way, when the outdoor weather changes (for example, in rainy weather or other scenes with insufficient light intensity) and the spectrum changes, the current of the main circuit and the auxiliary circuit can be automatically adjusted, so that the operating voltage of the top cell and the operating voltage of the bottom cell are both set to the ideal voltage value or close to the ideal voltage value, thereby solving the current mismatch phenomenon between the first cell layer (top cell) and the second cell layer (bottom cell), improving the power generation efficiency of the photovoltaic module, and saving costs.

[0053] Specifically, it works as follows:

[0054] When the current of the top cell and the bottom cell of the three-terminal stacked cell does not match, the compensation system (also called the control system) intervenes to make adjustments. The compensation system is used to monitor the current output of the top cell and the bottom cell in real time, and perform spectral analysis and calculate the compensation spectrum as needed. This compensation system can be set at a specific location of the photovoltaic module, such as the top or side, to facilitate communication and control with the spectrum-adjustable light source and other components.

[0055] Then, the compensation system calculates the compensation spectrum required for the top cell and the bottom cell to achieve current matching under actual illumination by analyzing the spectrum difference between actual illumination and standard illumination. Afterwards, the compensation system converts the required compensation spectrum into current and controls the current of the main circuit and the auxiliary circuit, usually by controlling the current of the auxiliary circuit to supply the main circuit, so that the voltage of the main circuit increases and the voltage of the auxiliary circuit decreases, so that the current output of the top cell and the bottom cell gradually approaches the set ideal voltage ratio, and finally reaches a matching state between the two. This can make the photovoltaic module in the best working state, improve the power generation efficiency, and save costs.

[0056] It should be noted that the compensation system in this embodiment is a conventional component in the photovoltaic field, and therefore, its working principle and specific structure will not be described in detail in this embodiment.

[0057] Exemplarily, the interconnection bar 700 in this embodiment is made of metal, and the interconnection bar 700 is welded to the top contact terminal T, the common contact terminal C, and the bottom contact terminal B, thereby realizing series connection between multiple battery cells 400 .

[0058] like Figure 2-Figure 3 As shown, when the number N of cells 400 in each cell string is greater than 6, it is defined as follows: the first three cells 400 of the cell string are F1, F2 and F3, respectively, and the last three cells 400 are L1, L2 and L3, respectively; the photovoltaic module includes a first junction box 1000 and a second junction box 2000, and the first junction box 1000 and the second junction box 2000 are both arranged on the back plate 900; and the first junction box 1000 and the second junction box 2000 can be arranged in multiples. Since the first three cells 400 and the last three cells 400 are at both ends of the cell string, and the continuous connection of the multiple cells 400 in the cell string is interrupted, in other words, the first three cells 400 and the last three cells 400 in each cell string do not participate in the connection of the middle cell 400, and the specific connection scheme of these six cells 400 is as follows:

[0059] The common contact terminal C (F1 C) and the bottom contact terminal B (F1 B) of the first battery cell 400 are respectively connected to the first junction box 1000 through the interconnection bar 700, the common contact terminal C (F2C) and the bottom contact terminal B (F2B) of the second battery cell 400 are respectively connected to the first junction box 1000 through the interconnection bar 700, and the common contact terminal C (F3C) of the third battery cell 400 is connected to the first junction box 1000 through the interconnection bar 700. It should be noted that, according to actual needs, the first junction box 1000 here can be set to one or more.

[0060] And, the top contact terminal T (L1 T) and the common contact terminal C (L1 C) of the last last cell 400 are respectively connected to the second junction box 2000 through the interconnection bar 700, the top contact terminal T (L2T) and the common contact terminal C (L2C) of the second last cell 400 are respectively connected to the second junction box 2000 through the interconnection bar 700, and the top contact terminal T (L3T) of the third last cell 400 is connected to the second junction box 2000 through the interconnection bar 700. It should be noted that, according to actual needs, the second junction box 2000 here can be set to one or more.

[0061] Therefore, the first three battery cells 400 and the last three battery cells 400 are not connected to other battery cells 400 in the battery string, but are directly connected to the first junction box 1000 and the second junction box 2000 using the interconnection strip 700, and then connected to the cable connector through the first junction box 1000 and the second junction box 2000 to form a lead-out end, and finally connected to the corresponding lead-out end of the adjacent photovoltaic module.

[0062] Optionally, the first battery layer and the second battery layer in this embodiment may both be perovskite batteries, so that the three-terminal stacked battery has a "perovskite stacked perovskite" structure. The first battery layer in this embodiment may be a perovskite battery, and the second battery layer may be a crystalline silicon battery, so that the three-terminal stacked battery has a "perovskite stacked crystalline silicon" structure.

[0063] For the convenience of description, in this embodiment, it is explained by taking the example that the first battery layer is set as a perovskite battery and the second battery layer is set as a crystalline silicon battery.

[0064] Optionally, in this embodiment, a preset spacing is set between two adjacent battery cells 400 in each battery string, and multiple preset spacings are equal. The setting of the preset spacing can facilitate the setting of the interconnection bar 700 between two adjacent battery cells 400, so that the interconnection bar 700 can conveniently connect the two adjacent battery cells 400, and can also avoid the phenomenon of overlapping of two adjacent battery cells 400 to cause hidden cracks or scratches.

[0065] Exemplarily, the preset spacing in this embodiment can be set to between 2 mm and 4 mm, which not only provides a certain space for the setting of the interconnection strip 700, but also allows more cells 400 to be arranged in a limited photovoltaic module area to improve the power of the photovoltaic module.

[0066] like Figure 1-Figure 3 As shown, the battery cell 400 in this embodiment includes a half-cell battery, which has several significant advantages over a whole-cell battery (i.e., a complete battery of conventional size):

[0067] First, the photovoltaic module with half-cell can reduce the thermal resistance loss, thereby reducing the power loss, making its output power about 5W-10W higher than the photovoltaic module with the same type of whole cell;

[0068] Second, the hot spot temperature of a half-cell battery is lower than that of a full-cell battery of the same type, which helps reduce the hot spot effect of photovoltaic modules and improve the stability and reliability of photovoltaic modules;

[0069] Third, half-cell batteries have size advantages. In applications such as large photovoltaic power stations, this size advantage can improve the utilization of materials and space.

[0070] Fourth, due to the reduction of internal current and resistance of half-cell batteries, packaging losses are also reduced accordingly, which helps to improve the photoelectric conversion efficiency of photovoltaic modules, increase power generation and save costs.

[0071] like Figure 1-Figure 3 As shown, the top contact terminal T in this embodiment is located at the short side of the half-cell battery, and the common contact terminal C and the bottom contact terminal B are respectively located at the two opposite long sides of the half-cell battery. This can avoid the phenomenon of cross-overlapping of multiple interconnection bars 700 during connection, and improve the reliability and stability of the connection of the interconnection bars 700.

[0072] Furthermore, the top contact terminal T, common contact terminal C and bottom contact terminal B of the cell 400 are all located on the backlight side of the half-cell. In this way, the interconnection bar 700 can be set to avoid blocking the light-receiving surface of the cell 400, thereby improving the photoelectric conversion efficiency of the photovoltaic module and increasing the power generation.

[0073] Optionally, the front panel 100 in this embodiment can be set to ultra-white tempered velvet glass, and the back panel 900 can be set to ordinary tempered glass, and its size is consistent with that of the front panel 100.

[0074] like Figure 1 As shown, in this embodiment, the photovoltaic module further includes a sealing strip 200. An annular groove is provided between the front plate 100 and the back plate 900, and the sealing strip 200 is wound in the annular groove. The sealing strip 200 is made of a material with low water vapor permeability, preferably butyl rubber. The sealing strip 200 is wound along the annular groove to form a closed circle, and its width is 10mm-15mm and its height is 0.8mm-1.2mm.

[0075] like Figure 1 As shown, in this embodiment, the photovoltaic module also includes a first packaging film 300 and a second packaging film 500, the battery string is arranged between the first packaging film 300 and the second packaging film 500, and the second packaging film 500 is provided with a plurality of first through holes 510 for the interconnection strips 700 to pass through.

[0076] The first packaging film 300 is a POE film or a TOP film with a low water vapor permeability. The packaging film is located in the area surrounded by the sealing strip 200. Its length and width are consistent with the inner length and width of the sealing strip 200, and its thickness is 0.4mm-0.6mm.

[0077] The length and width of the second packaging film 500 are consistent with those of the first packaging film 300. A first through hole 510 is designed in the second packaging film 500 corresponding to each battery cell 400 to facilitate electrical connection between the interconnection strip 700 and the top contact terminal T, common contact terminal C or bottom contact terminal B on the battery cell 400. The thickness of the second packaging film 500 is 0.1mm-0.2mm.

[0078] like Figure 1 As shown, the photovoltaic module in this embodiment further includes an insulating layer 600, which is disposed between the second encapsulating film 500 and the back plate 900. The insulating layer 600 is provided with a second through hole 610 corresponding to the first through hole 510, and the second through hole 610 is configured to penetrate the interconnection bar 700. The insulating layer 600 is made of a PET material with a thickness of 0.05 mm-0.15 mm, the length and width of the insulating layer 600 are consistent with the length and width of the second encapsulating film 500, and the positions and numbers of the second through holes 610 and the first through holes 510 are arranged one by one, and the shapes of the second through holes 610 and the first through holes 510 are consistent.

[0079] The second packaging film 500 and the insulating layer 600 can ensure that all components of the interconnection bar 700 except the welding points are located on the insulating layer 600, thereby forming insulation isolation from the battery cell 400, avoiding short circuit or local heat concentration, and improving safety.

[0080] like Figure 1 As shown, the photovoltaic module in this embodiment further includes a third packaging film 800 , which is disposed between the insulating layer 600 and the back plate 900 , and is provided with a third through hole 810 for the interconnection bar 700 to pass through.

[0081] The third packaging film 800 is made of POE film or TOP film with low water vapor permeability, and the third packaging film 800 is located in the area surrounded by the sealing strip 200. Its length and width are consistent with the inner length and width of the sealing strip 200, and the thickness can be set to 0.4mm-0.6mm. The third packaging film 800 is provided with a third through hole 810 for the interconnection strip 700 to pass through in the area of ​​the first and last battery cells 400 (the first three battery cells 400 and the last three battery cells 400).

[0082] In addition, the back plate 900 is further provided with a fourth through hole 910, and the positions and numbers of the fourth through holes 910 and the third through holes 810 are arranged one-to-one, and the shapes of the fourth through holes 910 and the third through holes 810 are consistent. This facilitates the interconnection bars 700 of the first three battery cells 400 and the interconnection bars 700 of the last three battery cells 400 to pass through the fourth through holes 910 in the back plate 900 and connect to the first junction box 1000 or the second junction box 2000.

[0083] The photovoltaic components in this embodiment are arranged in plurality, and are interconnected through the connector of the first junction box 1000 and the connector of the second junction box 2000 of the photovoltaic components, that is, the second junction box 2000 at the rear of the previous photovoltaic component is connected to the first junction box 1000 at the head of the next photovoltaic component, thereby forming a photovoltaic matrix.

[0084] Specifically, the top contact terminal T (L1 T) of the last cell 400 in the previous photovoltaic module is connected to the common contact terminal C (F3C) of the third cell 400 in the subsequent photovoltaic module; the common contact terminal C (L1 C) of the last cell 400 in the previous photovoltaic module is connected to the bottom contact terminal B (F2B) of the second cell 400 in the subsequent photovoltaic module; the top contact terminal T (L2T) of the second-to-last cell 400 in the previous photovoltaic module is connected to the common contact terminal C (F2C) of the second cell 400 in the subsequent photovoltaic module; the common contact terminal C (L2C) of the second-to-last cell 400 in the previous photovoltaic module is connected to the bottom contact terminal B (F1 B) of the first cell 400 in the subsequent photovoltaic module; the top contact terminal T (L3T) of the third cell 400 in the previous photovoltaic module is connected to the common contact terminal C (F1 C) of the first cell 400 in the subsequent photovoltaic module, thus completing the connection of all photovoltaic modules.

[0085] Obviously, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0086] Note that in the description of this specification, the reference terms "some embodiments", "other embodiments", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A photovoltaic module, characterized in that It comprises a front plate (100), a three-terminal laminated battery and a back plate (900), wherein the three-terminal laminated battery is located between the front plate (100) and the back plate (900); The three-terminal stacked battery comprises: N battery cells (400), each of the battery cells (400) comprising a first battery layer, a tunneling layer and a second battery layer, the tunneling layer being arranged between the first battery layer and the second battery layer and electrically connecting the first battery layer and the second battery layer; The first battery layer is provided with a top contact terminal (T), the tunneling layer is provided with a common contact terminal (C), and the second battery layer is provided with a bottom contact terminal (B); A plurality of interconnecting bars (700), wherein the interconnecting bars (700) connect the plurality of battery cells (400) in series to form a battery string; along the extension direction of the battery string, the top contact terminal (T) of the Xth battery cell (400) is connected to the common contact terminal (C) of the X+3th battery cell (400) through the interconnecting bars (700), and the common contact terminal (C) of the Xth battery cell (400) is connected to the bottom contact terminal (B) of the X+2th battery cell (400) through the interconnecting bars (700), 1≤X≤N-3, N≥4, and X and N are both positive integers.

2. The photovoltaic module according to claim 1, characterized in that: When the number N of the battery cells (400) in each battery string is greater than 6, the battery string has the first three battery cells (400) and the last three battery cells (400); the photovoltaic module comprises a first junction box (1000) and a second junction box (2000), and the first junction box (1000) and the second junction box (2000) are both arranged on the back plate (900); The common contact terminal (C) and the bottom contact terminal (B) of the first battery cell (400) are respectively connected to the first junction box (1000) via the interconnection bar (700), the common contact terminal (C) and the bottom contact terminal (B) of the second battery cell (400) are respectively connected to the first junction box (1000) via the interconnection bar (700), and the common contact terminal (C) of the third battery cell (400) is connected to the first junction box (1000) via the interconnection bar (700); and, The top contact terminal (T) and the common contact terminal (C) of the last-to-last battery cell (400) are respectively connected to the second junction box (2000) via the interconnection bar (700), the top contact terminal (T) and the common contact terminal (C) of the second-to-last battery cell (400) are respectively connected to the second junction box (2000) via the interconnection bar (700), and the top contact terminal (T) of the third-to-last battery cell (400) is connected to the second junction box (2000) via the interconnection bar (700).

3. The photovoltaic module according to claim 1, characterized in that: The first battery layer and the second battery layer are both perovskite batteries, or the first battery layer is a perovskite battery and the second battery layer is a crystalline silicon battery.

4. The photovoltaic module according to claim 1, characterized in that: In each battery string, a preset spacing is provided between two adjacent battery sheets (400), and a plurality of the preset spacings are equal.

5. The photovoltaic module according to claim 1, characterized in that: The battery cell (400) comprises a half-cell.

6. The photovoltaic module according to claim 5, characterized in that: The top contact terminal (T) is located at the short side of the half-cell battery, and the common contact terminal (C) and the bottom contact terminal (B) are respectively located at two opposite long sides of the half-cell battery.

7. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module comprises a first packaging film (300) and a second packaging film (500), the battery string is arranged between the first packaging film (300) and the second packaging film (500), and the second packaging film (500) is provided with a plurality of first through holes (510) for the interconnection strips (700) to pass through.

8. The photovoltaic module according to claim 7, characterized in that: The photovoltaic module further comprises an insulating layer (600), wherein the insulating layer (600) is arranged between the second packaging film (500) and the back plate (900), and a second through hole (610) corresponding to the first through hole (510) is opened on the insulating layer (600), and the second through hole (610) is configured to penetrate the interconnection strip (700).

9. The photovoltaic module according to claim 8, characterized in that: The photovoltaic module further comprises a third packaging film (800), wherein the third packaging film (800) is arranged between the insulating layer (600) and the back plate (900), and the third packaging film (800) is provided with a third through hole (810) for the interconnection strip (700) to pass through.

10. The photovoltaic module according to claim 9, characterized in that: The photovoltaic module further comprises a sealing strip (200); an annular groove is provided between the front plate (100) and the back plate (900); and the sealing strip (200) is wound in the annular groove.

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